Re: draft RFC: concept for partial, wal-based replication

[Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>]

Craig Ringer <craig(at)postnewspapers(dot)com(dot)au> writes:
> Just a side note: in addition to its use for partial replication, this
> might have potential for performance-prioritizing databases or tablespaces.

> Being able to separate WAL logging so that different DBs, tablespaces,
> etc went to different sets of WAL logs would allow a DBA to give some
> databases or tablespaces dedicated WAL logging space on faster storage.

I don't think this can possibly work without introducing data corruption
issues.  What happens when a transaction touches tables in different
tablespaces?  You can't apply the changes out-of-order.

			regards, tom lane